This practice GMAT test includes only questions on simple average concept, that are part of the GMAT problem solving section.
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A man drives 150 km from to in 3 hours and 20 minutes and returns to the place in 4 hours and 10 minutes. If is the average speed of the entire trip, then the average speed of the trip from to , exceeds by:
A. 5.0 km/hour
B. 4.5 km/hour
C. 4.0 km/hour
D. 2.5 km/hour
E. 3.5 km/hour
The average of 50 numbers is 38. If two numbers 45 and 55 are discarded, the average of the remaining set of numbers is:
A. 38.5
B. 36
C. 37.0
D. 36.5
E. 37.5
The average monthly salary of 8 workers and one supervisor in a factory was $430. When the supervisor, whose salary was $870 per month, retired, a new person was appointed and then the average salary of 9 people was $400 per month. The salary of the new supervisor is:
A. $700
B. $600
C. $430
D. $400
E. $500
The average age of a committee of 8 members is 40 years. A member, aged 55 years, retired and he was replaced by a member aged 39 years. The average age of the present committee is:
A. 39 years
B. 38 years
C. 36 years
D. 35 years
E. 37 years
The average of first 20 multiples of is:
A. 66.5
B. 67.5
C. 73.5
D. 74.5
E. 69.5
The average age of students of a school is 15 years. 10 students of average age 12 years join the school and the average age of a student of the school becomes 14.8 years. The original strength of the school was:
A. 60
B. 80
C. 120
D. 140
E. 100
In 5 compulsory subjects a candidate secures an average of 60%. In 2 optional subjects he secures equal marks and when these are added to his total, his average drops by 4%. How much did he secure in each optional subjects?
A. 56%
B. 52%
C. 50%
D. 46%
E. 48%
The average of a 8 scores is 87. Of these, the highest is 2 more than the one next in magnitude. If these two scores are eliminated the average of the remaining score is 85. What was the highest score?
A. 89
B. 90
C. 92
D. 94
E. 91
A candidate scores an aggregate of 60% marks, scoring an average of 56% in 4 of the papers and 68% in the others. How many papers were there totally?
A. 6
B. 7
C. 10
D. 9
E. None of these
A cricketer has a certain average for 9 innings. In the tenth he scores 50, thereby increasing his average by 4 runs. What is his new average?
B. 10
C. 14
D. 16
E. 8
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